rabbitmq的使用及对象序列化

最新推荐文章于 2024-03-14 14:39:14 发布

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最新推荐文章于 2024-03-14 14:39:14 发布

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文章标签： java-rabbitmq rabbitmq java

本文链接：https://blog.youkuaiyun.com/weixin_53202407/article/details/126356210

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本文介绍了如何在Java中使用RabbitMQ进行对象序列化配置，包括在配置类中设置，通过@Bean声明队列、交换机及其绑定关系。同时，详细阐述了监听者利用注解声明队列交换机的方法，以及机器消费者在消费消息后的确认机制（ack）。

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1.对象序列化在配置类中配置

   @Bean
    public MessageConverter messageConverter() {
        return new Jackson2JsonMessageConverter();
    }

2.配置类的和@Bean的方式声明队列和交换机及其绑定关系

@Configuration
public class RabbitMqConfig {

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Bean
    public MessageConverter messageConverter() {
        return new Jackson2JsonMessageConverter();
    }

    @Bean
    public Exchange exchange() {
        Exchange exchange = ExchangeBuilder.directExchange("hello.exchange.direct").durable(true).build();
        return exchange;
    }

    @Bean
    public Queue queue() {
        Queue queue = new Queue("hello.queue", true, false, false);
        return queue;
    }

    @Bean
    public Binding binding() {
        Binding binding = BindingBuilder.bind(queue()).to(exchange()).with("hello.test").noargs();
        return binding;
    }

    @PostConstruct
    //消息从生产者到mq的确认机制
    public void initRabbitMq() {
        rabbitTemplate.setConfirmCallback(new RabbitTemplate.ConfirmCallback() {
            @Override
            public void confirm(CorrelationData correlationData, boolean ack, String cause) {
                System.out.println("confirm ...correlationData" + correlationData + "ack=>" + ack + "==>cause" + cause);
            }
        });
        //消息从exchange到消费了就不会执行这段代码 反之
        rabbitTemplate.setReturnCallback(new RabbitTemplate.ReturnCallback() {
            @Override
            public void returnedMessage(Message message, int replyCode, String replyText, String exchange, String routingKey) {
                System.out.println("message = " + message + ", replyCode = " + replyCode + ", replyText = " + replyText + ", exchange = " + exchange + ", routingKey = " + routingKey);
            }
        });
    }
}

![在这里插入图片描述](https://img-blog.csdnimg.cn/de84fb5e6ef94c288b2bb6934895a590.png#pic_center)
配置文件中配置

3.监听者使用注解去声明队列交换机及绑定关系
机器消费者消费消息后的确认机制ack


public class RabbitMqListener {

    @RabbitListener(bindings =
    @QueueBinding(
            exchange = @Exchange(name = "hello.exchange.direct", type = ExchangeTypes.DIRECT),
            value = @Queue(name = "hello.queue"),
            key = "hello.test"
    )
    )
    public void getMsg(Message message, String msg, Channel channel) {

        MessageProperties messageProperties = message.getMessageProperties();
        long deliveryTag = messageProperties.getDeliveryTag();
        try {
            channel.basicAck(deliveryTag, false);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}